From 1992 to 2016, 783 U.S. workers died from the heat, according to a Public Citizen report. Those numbers are likely to increase with climate disruption.

Rainey was at his first day on the job as a temporary employee on Aug. 1, 2012. The temperature was expected to reach 89, but conditions were about 10 degrees hotter on the roof of the Miamisburg, Ohio, bank building.

Temporary employees such as Rainey are particularly at risk. The Public Citizen report said 17 of 23 heat deaths studied happened in the employee’s first three days on the job.

Sturgill’s attorney, Robert Dunlevey Jr., said the company’s workers were not exposed to excessive heat and that OSHA was trying to make an example out of the firm. The attorneys said an administrative law judge improperly inflated the heat index and that Rainey was in “exceptionally poor health.”

Rainey was sweating after his morning break and began walking clumsily. At 11:41 a.m. he became ill and collapsed, after five hours of working in direct sunlight, according to the Labor Department.